Reading values across an array

Question

Amavi Silva 2021-7-5

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评论： Amavi Silva 2021-7-7

I am trying to run an ecosystem model for the surface ocean which is forced by entrainment and detrainment of materials by the monthly changes of the Mixed Layer Depth (MLD). I have.....

MLD = [125;160;196;50;28;23;19;24;29;48;60;100]

.......for the 12 months of the year. I am planning to use an if statement to find the new concentration of the element after the entrainment/detrainment. For an example, I want to say....

if MLD(i+1) > MLD (i)

use the entrainment equation

Else if

use the detrainment equation

Nevertheless, I am not sure I know how to restructure my MLD array so that matlab can identifiy what is the (i)th value and what is the (i+1)th value at each step. I would be so grateful if anybody can help me sort this out.

Thank you so much in advance.

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Answer 1

Scott MacKenzie 2021-7-5

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The position of each element in an array is the element's index. The element can be retrieved for operations, such as relational comparisons as in your example, by using the index in parentheses after the name of the array. I suggest you review Array Indexing for further details and examples.

For your problem, here's how to set things up using a for-loop:

MLD = [125;160;196;50;28;23;19;24;29;48;60;100];
for i=2:length(MLD)
    if MLD(i) > MLD(i-1)
        % use entrainment equation here
    else
        % use detrainment equation here 
    end
end